I think it's a great setup! As someone mentioned to me if there weren't people out there willing to push the boundaries we wouldn't ever have come up with electricity, boats or Tow vehicles to begin with!
Double/Triples can and are being pulled safely all of the country with both trailers being bumper pulls! I don't think everyone should be doing it but there are people that have the mind set and the ability to do it and to do it safely!
We don't need dumb comments like "try backing it up" posted on sites like these! he was simply showing what he has created!
For your information the whole thing CAN be backed up! No it probably can't be done quickly or for long distances but it CAN be done! To me it takes more pre planning to make the stops at bcdefghijklmnopqrstuvwxy with the idea already in your head that you probably don't want to be backing up! Comments like that irritate me! As far as ependydads comparison he is spot on! It is pretty much sinful to put a motor home with a toad behind in reverse without first unhooking the toad due to the difficulty.